Pressure filter



March 2; 1937. s. wBRlGGS 2,072,393

PRESSURE FILTER Filed Feb. 5, 1954 44 l.` r Y Qi Y 5 off 55 Patentedl Mar. 2,v 1937 uNlTEnSTATEs 'PATENT OFFICE 'PRESSURE Fnzrrm. Southwick W. Briggs, Glenmont, Md. Application February 45, 1934, Serial No. 709,881

2 Claims.

The present invention relates to lters, particularly of the pressure type, and has for an object to prevent channeling of the ltering material by 5 contraction, settling Vand the like.

granular form if put in a cylindrical or other container will settleslightly and allow the fluid being ltered to passthrough the material by chan neling, and this settling takes place by gravity,

by movement of the material under pressure,`by wear on the particles of filtering material, and by liberation and displacement of air, gases and the the invention will be more fully described here-- inafter, and will be more particularly pointed out in the claims appended hereto. I

11n the drawing, wherein like symbols refer to like or corresponding parts throughout the several views,

.Figure 1 is a vertical section through a filter embodying the present invention. v v

Figure 2 is a transverse section 'taken through the upper end portion thereof on the line 2 2 of y,Figure 1. 4 v n Referring now to the drawing, there is shown one form of the invention. In this construction the casing 44 has a closed bottom 45 with a drain plug 46 therein and is open at its upper end with an outturned flange 41. providing a support or ledge for a cover 46 which is secured to the ange 41 by clamping bolts 49, or` the like, a packing gasket 50 being interposed between the ange 41 and the marginal edge portion of the cover 48. Within the lower end of the casing 44 is disposed a false bottom or disc 5| having perforations 52 therein and which supports .on its upper surface a screen 53 of:=suitablemesl i for supporting a iiltering material dy 54 bove the partition 5l.' The partition 5I vis sp ced above-I the bottom 45 'casing adapted to receive oil forced downwardly through4 the filtering body 54 L and the screen 53,'

and the casing-44 at one side is provided with an It has been found that a filtering material o'fof the casing a distance sufiicient to provide a compartment or chamber-in the bottom of vthe (Cl. B10-131) or other substance being treated is carried oil'.

In the upper end oi the casing. 44 is disposed a piston or follower 56 which slidably fits in the casing 44 and is adapted to rest upon the upper end of the iiltering material body 54. The piston 56 is provided with a number of perforations or openings 51 and may carry a screen 58 at its under side adapted to lie in contact with the upper surface portion of the filtering material.

Within the space Iabove the piston 56 is disposed an expanding spring 59 or the like which bears at' one end upon the piston 56 and at its other end against the cover 48, and the'latter m'ay be Adomed or otherwise suitably constructed for receiving 'and centering'the upper end of the spring 59. The spring 59 may be reduced inv vdiameter at its upper end to seat in the cover`48.

The space between the cover 48 and the piston 56 provides an inlet compartment adapted to receive oil or the like under pressure through an inlet pipe 6l) which opens through the side of the casing 44, as shown in Eigure 1. The oil under pressure entering the upper end of the casing 44 passes downwardly through the perforations 51 into piston 56 and is forced through the filtering lmaterial body 54 and thence, outwardly through the pipe 55 at the bottom of the casing. The spring 58 is of predetermined pressure so as to maintain the desired degree of compactness of thev filtering lmaterial body 54, and any settling of the lte'ing material is quickly taken up lby the advance ofthe piston 56 thereagainst to prevent channeling and to maintain at all times the desired even pressure on the filtering material.

With a ltering element of this type constantly under a pressure tending to hold the material at a uniform compactness, when there is a relief of pressure in the filter, internal erpansion takes place in the filtering element body which frequently eiiects separation of the filtering particles and channeling through the iilter element. When there is a tendency for this action to take place, the pressure element 56 follows upl any possible contraction of the lter body so as to maintain the same at all times in a uniform condition of compactness.

1. A filter comprising a substantially cylindrical cas having an intake adjacent one end and an outle adjacent the other end, a pair of spaced apart perforate partitions in the casing between the intake and outlet and dividing the vcasing into an intake chamber. anoutlet chamber and an intermediate ltering chamber, the partition between the intake andfiltering chamber being movable, a removable end wall for said intake chamber provided with a concave offset axial portion, a spring in said intake chamber having one end thereof relatively large and engaging against said movable partition adjacent the marginal edge portion thereof and the other end re1- atively small and engaging within said concave axial portion, and a granular ltering means within said filtering chamber adapted to remove impurities in the oil passing therethrough.

2. A ilter comprising a substantially cylindrical casing, said casing having an inlet opening adjacent one end and an outlet opening adjacent the other end, said one end being open and said other end being closed, a pair of spaced apart perforate partitions within the casing inwardly of each end thereof and dividing the casing into an mediate iilter chamber, a pair of screens in the illter chamber engaging one against each partltlon, an annular flange carried by the casing at the open end thereof, a closure plate engaging said flange, means for securing said plate on said ange, said plate having a centrally disposed concavo-convex portion with the concave side *thereof innermost, the partition between the intake chamber and the filter chamber being movable, and a spring in said intake chamber having one end thereof relatively large and engaging against said movable plate adjacent the marginal edge portion thereof and the other end relatively small and seated in the concave portion of said closure plate, and a granular filtering means within said lter chamber and adapted to remove impurities in the oil passing therethrough.

SOUTHWICK /W. BRIGGS. 

